The excavator market is packed with equipment brands, each using slightly different hydraulic cylinder designs and seal specifications. Knowing which seal kits fit your machines can save you hours of frustration, thousands in downtime costs, and help you make smarter purchasing decisions for your fleet.
In this guide, we cover the top excavator brands and the key models in each lineup, along with tips for finding the right excavator seal kits for each.
1. Caterpillar (CAT)
Caterpillar is the world’s largest construction equipment manufacturer, with an enormous range of excavators from compact 5-ton machines to 800-ton mining giants.
Popular CAT excavator models:
- CAT 308D CR SB: Compact excavator — requires the widely-used CAT 308D seal kit (Part No. 4157469)
- CAT 320D / 320D2: The world’s best-selling 20-ton excavator
- CAT 336F / 336GC: Large excavators for heavy civil engineering and mining
- CAT 390D / 390F: Ultra-large excavators for mining and quarry operations
2. Komatsu
Japanese manufacturer Komatsu is Caterpillar’s closest global competitor, known for advanced hydraulic technology and fuel efficiency. Key models: PC78, PC200, PC210, PC300, PC360, PC400, PC450.
Browse our complete range of Komatsu excavator seal kits for all cylinder types and bore sizes.
3. Hitachi Construction Machinery
Hitachi produces the popular Zaxis (ZX) series excavators. Popular models: ZX120, ZX200, ZX210, ZX330, ZX350, ZX490, ZX520.
Our Hitachi excavator seal kits are manufactured to match the exact dimensions of Hitachi ZX-series cylinders.
4. Hyundai Construction Equipment
Hyundai R-series excavators have gained significant market share. Popular models: R55, R80, R140, R160, R210, R220, R290, R320, R450, R520.
5. Kobelco
Kobelco excavators are known for their independent hydraulic circuit designs. Key models: SK55, SK75, SK130, SK200, SK210, SK295, SK330, SK350.
6. Volvo Construction Equipment
Volvo excavators are renowned for operator safety and comfort features. EC series excavators use Volvo’s proprietary hydraulic technology with unique seal specifications.
7. Doosan (Doosan Infracore)
Doosan produces the popular DX and DH series excavators. Browse our Doosan seal kits for all models.
8. JCB
British manufacturer JCB produces JS series and CX series excavators popular in markets where JCB brand loyalty is strong.
9. Liebherr
German manufacturer Liebherr produces premium excavators known for engineering precision. Popular models: R914, R924, R934, R946, R950, R976. Our Liebherr hydraulic seal kits meet these demanding specifications.
10. Kato (H Kato)
Kato produces compact and medium excavators known for reliability. Many Kato seals are cross-compatible with other Japanese manufacturers.
How to Find the Right Seal Kit for Your Machine
- Identify your exact model and serial number — found on the machine’s ID plate.
- Identify the cylinder type — boom, arm/stick, bucket, blade, or other attachment cylinder.
- Find the OEM part number — often stamped on the old seal or listed in the parts manual.
- Cross-reference — use the OEM part number or machine model to find compatible aftermarket kits.
Shop our complete excavator parts store for seal kits covering all major brands and hundreds of models.
Conclusion
Understanding the seal kit requirements for your excavator fleet helps you make smarter maintenance decisions, reduce downtime, and control costs. Whether you operate CAT, Komatsu, Hitachi, Hyundai, or any other major brand, the right seal kit is available — often at a fraction of OEM pricing with premium aftermarket quality.
Keywords: excavator seal kit brands, CAT seal kit, Komatsu seal kit, Hitachi seal kit, Hyundai seal kit, Kobelco seal kit, Volvo excavator parts
